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Steam Boiler Low Pressure
I hope I'm not breaking any forum rules, but saw that my issue wasn't getting any love any more:https://forum.heatinghelp.com/discussion/175351/no-pressure-from-steam-boiler-compared-to-last-year#latest
Boiler has lower pressure compared to last year. Ruled out main vents, gas firing rate is correct, no leak in boiler itself (1hr 15min test filled to over top), no leaks at radiator supply valves, no water in gauge assembly.
No air puffing from Gorton main vent like last year (replaced it too). Main vents do get hot. I have one known sagging pipe and its radiator intermittently heats. Could this pipe be condensing so much water that the pressure would not build up?
Any recommended tests to help further troubleshoot or any known ways this can possibly happen?
Thanks for the help!